linux-kernel - [PATCH v3 5/6] cpuidle: Respect the CPU system wakeup QoS limit for cpuidle

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Message-ID: <20251121100315.316300-6-ulf.hansson@linaro.org>
Date: Fri, 21 Nov 2025 11:03:11 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
	linux-pm@...r.kernel.org
Cc: Vincent Guittot <vincent.guittot@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Kevin Hilman <khilman@...libre.com>,
	Pavel Machek <pavel@...nel.org>,
	Len Brown <len.brown@...el.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Maulik Shah <quic_mkshah@...cinc.com>,
	Prasad Sodagudi <psodagud@...cinc.com>,
	Dhruva Gole <d-gole@...com>,
	Deepti Jaggi <quic_djaggi@...cinc.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 5/6] cpuidle: Respect the CPU system wakeup QoS limit for cpuidle

The CPU system wakeup QoS limit must be respected for the regular cpuidle
state selection. Therefore, let's extend the common governor helper
cpuidle_governor_latency_req(), to take the constraint into account.

Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---

Changes in v3:
	- New patch.

---
 drivers/cpuidle/governor.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/cpuidle/governor.c b/drivers/cpuidle/governor.c
index 0d0f9751ff8f..5d0e7f78c6c5 100644
--- a/drivers/cpuidle/governor.c
+++ b/drivers/cpuidle/governor.c
@@ -111,6 +111,10 @@ s64 cpuidle_governor_latency_req(unsigned int cpu)
 	struct device *device = get_cpu_device(cpu);
 	int device_req = dev_pm_qos_raw_resume_latency(device);
 	int global_req = cpu_latency_qos_limit();
+	int global_wake_req = cpu_wakeup_latency_qos_limit();
+
+	if (global_req > global_wake_req)
+		global_req = global_wake_req;
 
 	if (device_req > global_req)
 		device_req = global_req;
-- 
2.43.0